Statistics - Unit 3

Which summary statistics should be used to describe the given data?

• the mean and standard deviation

• the mean and IQR

• the median and standard deviation

• the median and IQR

Standard deviation is a measure of

• spread

• center

• shape

• outliers

Which best describes the shape of the histogram?

• uniform

• unimodal

• bimodal

• skewed right

Which of the following are true about the IQR? Check all that apply.

• IQR = Q3 - Q1

• IQR = Q1 - Q3

• The IQR is the middle 50% of a distribution

• IQR stands for interquartile range

• The IQR is the width of the box in a boxplot

Which of the numbers below is NOT part of a 5 number summary used to create a boxplot?

• minimum

• first quartile

• mean

• third quartile

• maximum

How do you determine if a data value is an outlier? Check all that apply.

• Q1 - 1.5IQR

• Q1 + 1.5IQR

• Q3 - 1.5IQR

• Q3 + 1.5IQR

Which of the following measures is affected by addition/subtraction? Check all that apply.

• mean

• median

• standard deviation

• range

• Q1

Which of the following measures is affected by multiplication/division? Check all that apply.

• mean

• median

• standard deviation

• range

• Q1

Which of the following are things to discuss when describing a distribution (histogram, stemplot, boxplot, dotplot, etc.)? Check all that apply

• Shape

• Outliers

• Center

• Spread

Which of the following do you NOT use to describe a scatterplot?

• Form

• Direction

• Spread

• Unusual Features

• Strength